/**
 * IK 中文分词 版本 5.0
 * IK Analyzer release 5.0
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 源代码由林良益(linliangyi2005@gmail.com)提供
 * 版权声明 2012，乌龙茶工作室
 * provided by Linliangyi and copyright 2012 by Oolong studio
 */
package org.wltea.analyzer.cfg;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.InvalidPropertiesFormatException;
import java.util.List;
import java.util.Properties;

import org.apache.lucene.util.Version;

/**
 * Configuration 默认实现
 * 2012-5-8
 */
public class DefaultConfig implements Configuration {
    public static final Version LUCENE_VERSION      = Version.LUCENE_42;
    /*
     * 分词器默认字典路径
     */
    private static final String PATH_DIC_MAIN       = "main.dic";
    private static final String PATH_DIC_QUANTIFIER = "quantifier.dic";
    /*
     * 分词器配置文件路径
     */
    private static final String FILE_NAME           = "IKAnalyzer.cfg.xml";
    // 配置属性——扩展字典
    private static final String EXT_DICT            = "ext_dict";
    // 配置属性——扩展停止词典
    private static final String EXT_STOP            = "ext_stopwords";
    private Properties          props;
    /*
     * 是否使用smart方式分词
     */
    private boolean             useSmart;

    /**
     * 返回单例
     * 
     * @return Configuration单例
     */
    public static Configuration getInstance() {
        return new DefaultConfig();
    }

    /*
     * 初始化配置文件
     */
    private DefaultConfig() {
        this.props = new Properties();
        final InputStream input = this.getClass().getClassLoader().getResourceAsStream(DefaultConfig.FILE_NAME);
        if (input != null) {
            try {
                this.props.loadFromXML(input);
            } catch (final InvalidPropertiesFormatException e) {
                e.printStackTrace();
            } catch (final IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 返回useSmart标志位
     * useSmart =true ，分词器使用智能切分策略， =false则使用细粒度切分
     * 
     * @return useSmart
     */
    @Override
    public boolean useSmart() {
        return this.useSmart;
    }

    /**
     * 设置useSmart标志位
     * useSmart =true ，分词器使用智能切分策略， =false则使用细粒度切分
     * 
     * @param useSmart
     */
    @Override
    public void setUseSmart(final boolean useSmart) {
        this.useSmart = useSmart;
    }

    /**
     * 获取主词典路径
     * 
     * @return String 主词典路径
     */
    @Override
    public String getMainDictionary() {
        return DefaultConfig.PATH_DIC_MAIN;
    }

    /**
     * 获取量词词典路径
     * 
     * @return String 量词词典路径
     */
    @Override
    public String getQuantifierDicionary() {
        return DefaultConfig.PATH_DIC_QUANTIFIER;
    }

    /**
     * 获取扩展字典配置路径
     * 
     * @return List<String> 相对类加载器的路径
     */
    @Override
    public List<String> getExtDictionarys() {
        final List<String> extDictFiles = new ArrayList<String>(2);
        final String extDictCfg = this.props.getProperty(DefaultConfig.EXT_DICT);
        if (extDictCfg != null) {
            // 使用;分割多个扩展字典配置
            final String[] filePaths = extDictCfg.split(";");
            if (filePaths != null) {
                for (final String filePath : filePaths) {
                    if ((filePath != null) && !"".equals(filePath.trim())) {
                        extDictFiles.add(filePath.trim());
                    }
                }
            }
        }
        return extDictFiles;
    }

    /**
     * 获取扩展停止词典配置路径
     * 
     * @return List<String> 相对类加载器的路径
     */
    @Override
    public List<String> getExtStopWordDictionarys() {
        final List<String> extStopWordDictFiles = new ArrayList<String>(2);
        final String extStopWordDictCfg = this.props.getProperty(DefaultConfig.EXT_STOP);
        if (extStopWordDictCfg != null) {
            // 使用;分割多个扩展字典配置
            final String[] filePaths = extStopWordDictCfg.split(";");
            if (filePaths != null) {
                for (final String filePath : filePaths) {
                    if ((filePath != null) && !"".equals(filePath.trim())) {
                        extStopWordDictFiles.add(filePath.trim());
                    }
                }
            }
        }
        return extStopWordDictFiles;
    }
}
